Shell-plug.



L. F. STAFFORD.

SHELL PLUG.

MPUCATION FKLED FEB.I1. 1915.

1,269,875 Patented Jnnv 18, 1918 Fig.1.

7 Invemor attorney Lac ESi'afford W UNITED STATES PATENT OFFICE.

LAC F. STAFFORD, 0F MINNEAPOLIS, MINNESOTA, ASSIGNOR TO FAIRBANKS, SCHOOK AND COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA.

SHELL-PLUG.

Application filed February 11, 1918.

To all whom it may concern:

Be it known that I, LAC F. STAFFORD, a citizen of the United States, and a resident of Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Shell- Plugs, of which the following is a specification.

One object of my invention is to provide a simple and. inexpensive plug for tightly closing the ends of shrapnel shells and the like.

Another object of my in venlion to proride in a shell plug two disks joined to gether, one of the disks sewing a seal for a. shell and the other of the disks being formed into a screw thread to engage with a thread of the shell.

Another object of my invention is to pro vide improved means for inserting the shell plug into a shell.

W'ith these and incidental objects in view the invention consists of certain novel fcaturcs of construction and combination of parts, the essential elements of which are hereinafter described with reference to thedrawing which accompanies and forms a part of this specification.

In the drawing Figure l is a back view of the outer disk of the plu Fi 2 is a similar view of the inner disli of t e plug; Fig. 3 is a back view of the complete plug assembled, and Fig. 4 is a sectional view showing the plug applied to a shell.

The disk 1, Fig. 1, has formed therein, centrally located, a socket 2, Figs. 1 and 4, the socket preferably being hexagonal in shape.

The disk is dished as at 3, Figs. 1 and 4, so the angle of the face t will correspond to the beveled edge of a shell 5 to which the plu r islto' be applied.

T e second disk ,6 is formed along its outer perimeter in a helix 7 of the same pitch. as

the threads 8 of the shell to which the plug is to be applied.

The disk 6 has a hexagonal. shaped apcrture 9 adapted to fit over the socket 2 formed in the disk 1, and the two disks are joined together by spot welds 10.

With the disks s0 assembled it is evident Specification of Letters Patent.

Patented June 18, 1918.

Serial No. 216,616.

that the inner disk 6 forms one thread of a screw adapted to engage with the screw thread 8 of the shell, and when the plug is screwed home by placing a suitable wrench in the socket 2, the face 4 of the shell will be securely sealed by the dished portion 3 of the outer disk of the plug forming a seal without the use of a gasket, although a gasket may, oi course, be used if desired.

As the two parts of the plug are formed preferably of steel. it is evident that they may he used over and over again for shell shipping and that they are not subject to the deterioration and wear that plugs of softer matter would be subject to.

While I have described my invention and illustrated it in one particular design, I do not. wish it understood that I limit myself to this construction, as it is evident that the application of the invention may be varied in many ways within the scope of the foll nving claims.

Claims:

1. In a shell plu the combination of an outer disk to seal t e open end of an interiorly threadeH shell, and an inner disk concentrically joined with said outer disk and having its perimeter formed into a helix for cotiperation with the threads of the shell.

2. In a shell plug the combination of an outer disk to seal the open end of an interiorly threaded shell and an inner disk con centrically joined with said outer disk and having its perimeter .formed into a helix for cotiperation with the threads of a shell, said outer disk having formed in the center thereof a socket for turning the plug into a threaded shell.

3. In, a shell plug the combination of an outer disk havin a centrally located socket therein, the perimeter of said disk being turned back to seal an interiorly threaded shell. means welded to said outer disk for engagement with the threads of the interiorly threaded shell for drawing said outward disk into intimate contact with the outer end surface of said shell.

1-. In a shell plug the combination of a dished disk having a centrally located socket therein, an inner disk having an aperture therein to clear said socket, said inner disk having its perimeter formed into a spiral to correspond with the threads of a shell to which the plug is to be applied, said two disks being welded together and concen- 5 trically mounted.

5. In a shell plug the combination of an outer shell sealing disk, an inner disk eoneentrically mounted therewith and suitably fastened thereto, said inner disk having means for screw engagement with the 10 threads of an interiorl threaded shell.

LAC F. STAFFORD. 

